Ultrasonics are those sounds whose frequency is - – McqOptions

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1.	Ultrasonics are those sounds whose frequency is -
A.	20000 हर्टज से अधिक
B.	10000 हटर्ज से कम
C.	1000 हटर्ज से बराबर
D.	none of the above
Answer» B. 10000 हटर्ज से कम

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